Supply device for supplying liquid waste to a low-temperature melting furnace and

Abstract

The present disclosure relates to a supply apparatus for supplying liquid waste to a cryogenic furnace. The supply apparatus for supplying a liquid waste material to a low-temperature melting furnace includes: a storage unit in which the liquid waste material and a solvent are stored; a supply pipe through which the liquid waste and the solvent are supplied from the storage unit to a melting space in the low-temperature melting furnace; and a conveying unit at least partially located in the supply pipe and forcibly injecting the liquid waste material and the solvent into the melting space via the spiral supply flow path.

Description

Technical Field

[0001] The present disclosure relates to a supply device for supplying liquid waste to a low-temperature melting furnace and a supply method using the same. Background Art

[0002] Radioactive waste generated by nuclear power generation requires more stable treatment, storage, and management. Among the methods used to treat and store hazardous waste, low-temperature furnace vitrification technology has been developed.

[0003] Low-temperature furnace vitrification technology uses an induction-heated, low-temperature furnace to burn hazardous waste, melt heavy metals, and vitrify them into a glassy solid, trapping them within the glass structure and isolating them from leaching into the surrounding environment.

[0004] When the vitrification apparatus is operated to perform vitrification, waste (combustible solid waste, slurry, etc.) is fed into the upper portion of the low-temperature melting furnace through a waste supply pipe installed at the upper portion of the furnace and is thermally decomposed.

[0005] In the case of feeding liquid waste into a vitrification device (low temperature furnace), in the past, a simple tubular feed pipe was used, which made it difficult to quantify the waste. In addition, there were problems such as contamination diffusion and backflow. Summary of the Invention

[0006] Technical issues

[0007] One aspect of the present disclosure is directed to providing a supply device for supplying liquid waste to a low-temperature furnace and a supply method using the same.

[0008] Technical Solution

[0009] Embodiments of the present disclosure relate to a supply device for supplying liquid waste to a low-temperature furnace. The supply device includes a storage unit that stores the liquid waste and a solvent; a supply pipe through which the liquid waste and the solvent are supplied from the storage unit to a melting space in the low-temperature furnace; and a conveying unit that is at least partially located in the supply pipe and forcibly injects the liquid waste and the solvent into the melting space via a spiral supply flow path.

[0010] The storage unit may include a first storage tank in which the liquid waste is stored, and a second storage tank separate from the first storage tank and in which the solvent is stored.

[0011] A regulating member that independently regulates inflow amounts of the liquid waste and the solvent flowing from the storage unit into the supply pipe may further be included.

[0012] The conveying unit may include a rotatable screw, wherein the screw may prevent the liquid waste material evaporated in the melting space from flowing back.

[0013] The conveying unit may further include a central shaft, the screw may be connected to the central shaft, and an outer diameter of blades of the screw may be 95% to 100% of an inner diameter of the supply pipe.

[0014] An embodiment of the present disclosure relates to a supply method for supplying liquid waste to a low-temperature furnace.

[0015] A supply method for supplying liquid waste to a low-temperature melting furnace includes: supplying the liquid waste to a melting space of the low-temperature melting furnace through a supply pipe using a conveying unit including a spiral structure; melting the supplied liquid waste in the melting space; discharging the melted liquid waste from the melting space; and purifying the supply pipe and the conveying unit by supplying a solvent after discharging the liquid waste.

[0016] Beneficial effects

[0017] Embodiments of the present disclosure provide a supply device for supplying liquid waste to a low-temperature furnace and a supply method using the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A supply device for supplying liquid waste to a low-temperature furnace according to an embodiment of the present disclosure is shown.

[0019] Figure 2 is a flowchart illustrating a supply method for supplying liquid waste to a low-temperature furnace according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0020] Hereinafter, the present disclosure will be described in more detail with reference to the accompanying drawings.

[0021] The accompanying drawings are merely examples for illustrating the technical concept of the present disclosure in more detail, and therefore, the concept of the present disclosure is not limited to the accompanying drawings. In addition, the size and spacing of the drawings may be exaggerated to illustrate the relationship between components.

[0022] Figure 1 A supply device for supplying liquid waste to a low-temperature furnace (hereinafter, referred to as a “supply device”) according to an embodiment of the present disclosure is shown.

[0023] The low-temperature furnace of the embodiment of the present disclosure refers to a low-temperature furnace of a vitrification device for processing radioactive waste (liquid waste or solid waste) in a nuclear power plant, but is not limited thereto.

[0024] The supply device 1 includes a storage unit 100 , an adjusting member 200 , a supply pipe 300 , and a conveying unit 400 .

[0025] The storage unit 100 stores liquid waste and a solvent, and includes a first storage tank 110 and a second storage tank 120 .

[0026] The first storage tank 110 stores liquid waste. The first storage tank 110 can be filled with liquid waste to a set capacity, but is not limited thereto. In another embodiment, the first storage tank 110 can be filled with molten target materials, such as radioactive waste, general industrial waste, ceramic materials, and metal materials.

[0027] Reference Figure 1 , the first storage tank 110 is shown as a tank shape, but is not limited thereto. In another embodiment, the first storage tank 110 can be provided as a conventional structure.

[0028] Although not shown, a separate device such as a pump may be further installed to ensure that the liquid waste in the first storage tank 110 smoothly flows into the supply pipe 300 .

[0029] The second storage tank 120 is separated from the first storage tank 110 and stores the solvent. The second storage tank 120 may be filled with the solvent to a set capacity and may be provided in a conventional structure.

[0030] In this embodiment, the solvent stored in the second storage tank 120 may be a general solvent used for decontaminating components that come into contact with liquid waste.

[0031] Although not shown, a separate device such as a pump may be further installed to ensure that the solvent in the second storage tank 120 smoothly flows into the supply pipe 300 .

[0032] Reference Figure 1 The regulating member 200 independently regulates the inflow amount of the liquid waste and the solvent flowing from the storage unit 100 into the supply pipe 300. In particular, since the mixing ratio of the liquid waste and the solvent can be adjusted by the regulating member 200, the liquid waste and the solvent supplied to the melting space K through the supply pipe 300 can be supplied more efficiently.

[0033] Reference Figure 1 , the regulating member 200 is shown as being located in a separate pipe connected between the storage unit 100 and the supply pipe 300, but is not limited thereto. In another embodiment, the regulating member 200 may be installed in a form in which at least a portion thereof is coupled to the storage unit 100.

[0034] The adjusting member 200 includes a first adjusting member 210 , a second adjusting member 220 and a third adjusting member 230 .

[0035] The first regulating member 210 regulates an inflow amount of the liquid waste discharged from the first storage tank 110 .

[0036] Reference Figure 1 The first regulating member 210 may be installed in a valve-like shape, but is not limited thereto. Here, the inflow of the liquid waste supplied from the first storage tank 110 to the supply pipe 300 may be regulated by opening and closing the valve.

[0037] The second regulating member 220 regulates an inflow amount of the solvent discharged from the second storage tank 120 .

[0038] Reference Figure 1 The second regulating member 220 may be installed in a shape similar to a valve, but is not limited thereto. Here, the inflow amount of the solvent supplied from the second storage tank 120 to the supply pipe 300 may be regulated by opening and closing the valve.

[0039] The third regulating member 230 regulates an inflow amount of the mixture of the liquid waste and the solvent flowing into the supply pipe 300 .

[0040] Reference Figure 1 The third regulating member 230 may be installed in a valve-like shape, but is not limited thereto. Here, the inflow of the mixture of liquid waste and solvent supplied from the first storage tank 110 and the second storage tank 120 to the supply pipe 300 may be regulated by opening and closing the valve.

[0041] The liquid waste and the solvent are supplied from the supply pipe 300 and the storage unit 100 to the melting space K of the low-temperature furnace.

[0042] In this embodiment, the low-temperature furnace for melting the liquid waste is not limited to a specific type.

[0043] Reference Figure 1 , the supply pipe 300 is shown as being formed as a straight pipe as a whole, but is not limited thereto. In another embodiment, the supply pipe 300 can be of various shapes that can facilitate the injection of liquid waste and solvent, and can be made of a flexible material.

[0044] Although not shown, the supply pipe 300 may further include a heat source device (eg, a heater) surrounding at least a portion thereof to facilitate the flow of the liquid waste and solvent through the supply pipe 300 .

[0045] The conveying unit 400 is at least partially located within the supply pipe 300 and forcibly injects the liquid waste and the solvent into the melting space K through a spiral supply flow path.

[0046] The conveying unit 400 includes a rotatable screw and prevents backflow of the liquid waste evaporated in the melting space K.

[0047] The screw is an overall elongated hollow tube and, although not shown, may further include a screw body having screw blades formed on the outside and a screw extension extending from the screw body and having no screw blades formed thereon.

[0048] The screw blades may be provided in various shapes, for example, continuously formed or discontinuously formed.

[0049] The conveying unit 400 also includes a central shaft I, a screw is connected to the central shaft I, and the outer diameter of the screw blade can be 80% to 100%, 85% to 100% and 90% to 100% of the inner diameter of the supply pipe, and suitably 95% to 100%.

[0050] By rotating the central shaft I connected to the screw, the entire screw is rotated, and the liquid waste is efficiently supplied to the melting space K by the rotation of the screw.

[0051] Reference Figure 2 A supply method of supplying liquid waste to a low-temperature furnace using the supply device according to an embodiment of the present disclosure will be described.

[0052] Figure 2 is a flowchart illustrating a supply method for supplying liquid waste to a low-temperature furnace according to an embodiment of the present disclosure.

[0053] First, liquid waste is supplied to the melting space K of the low-temperature melting furnace through the supply pipe 300 using the conveying unit 400 including a screw structure ( S100 ).

[0054] When the liquid waste flows from the first storage tank 110 into the supply pipe 300, the liquid waste is supplied to the melting space K of the final low-temperature furnace through the conveying unit 400. Here, the liquid waste is supplied from the first storage tank 110 through the conveying unit 400 in the supply pipe 300 by forced injection.

[0055] Specifically, the liquid waste supplied to the supply pipe 300 is efficiently supplied to the melting space K through the rotating screw connected to the central shaft I.

[0056] Since the liquid waste is efficiently supplied by the screw, various problems that occur when conventional waste is input (blockage of the waste in the pipe, evaporation, splashing, etc.) can be greatly reduced, and the melting process through the melting space K can be stably performed. In addition, the screw can have a positive effect on the efficient injection of the liquid waste and also contribute to the cleaning of the supply pipe 300 and the conveying unit 400.

[0057] In this regard, the inflow amount of the liquid waste is regulated by the regulating member 200. In particular, the inflow amount of the liquid waste supplied from the first storage tank 110 to the supply pipe 300 is appropriately regulated by the first regulating member 210.

[0058] Then, the supplied liquid waste is melted in the melting space K ( S200 ). In this regard, in the case where the liquid waste is evaporated by being melted in the melting space K, backflow is prevented by the conveying unit 400 .

[0059] Next, the melted liquid waste is discharged from the melting space K (S300).

[0060] Although not shown, a separate device may be further installed to post-treat the molten liquid waste discharged from the melting space K, and through such post-treatment, vaporization of harmful substances and radionuclides generated during thermal decomposition of the waste may be reduced.

[0061] Finally, after the liquid waste is discharged, a solvent is supplied to clean the supply pipe 300 and the delivery unit 400 (S400). Here, the solvent is supplied from the second storage tank 120 through the delivery unit 400 in the supply pipe 300 by forced injection.

[0062] Specifically, the solvent supplied to the supply pipe 300 and the transfer unit 400 purifies remaining hazardous substances and radioactive nuclides according to the supply of liquid waste, thereby minimizing the amount of radioactive leakage of the waste discharged to the outside.

[0063] In this embodiment, the solvent is supplied after the melted liquid waste is discharged from the melting space K, but is not limited thereto. In another embodiment, the solvent may be supplied simultaneously with the liquid waste to clean the supply pipe 300 and the conveying unit 400 .

[0064] The foregoing embodiments are provided as examples to illustrate the present disclosure, and the present disclosure is not limited thereto. Since ordinary technicians in the technical field of the present disclosure will be able to implement the present disclosure by making various modifications thereto, the technical protection scope of the present disclosure should be defined by the appended claims.

Claims

1. A supply device for supplying liquid waste to a low-temperature furnace, the supply device comprising: a storage unit storing the liquid waste and the solvent; a supply pipe through which the liquid waste and the solvent are supplied from the storage unit to a melting space in the low-temperature furnace; as well as A conveying unit is at least partially located in the supply pipe and forcibly injects the liquid waste and the solvent into the melting space via a spiral supply flow path.

2. The supply device according to claim 1, wherein The storage unit comprises: a first storage tank in which the liquid waste is stored; and a second storage tank, the second storage tank being separate from the first storage tank and the solvent being stored in the second storage tank. 3 . The supply device according to claim 2 , further comprising a regulating member that independently regulates inflow amounts of the liquid waste and the solvent flowing from the storage unit into the supply pipe.

4. The supply device according to claim 1, wherein: The conveying unit includes a rotatable screw, wherein the screw prevents liquid waste evaporated in the melting space from flowing back.

5. The supply device according to claim 4, wherein: The conveying unit further includes a central shaft, The screw is connected to the central shaft, and The outer diameter of the blade of the screw is 95% to 100% of the inner diameter of the supply pipe.

6. A method for supplying liquid waste to a low-temperature furnace, the method comprising: supplying the liquid waste to the melting space of the low-temperature melting furnace through a supply pipe using a conveying unit including a screw structure; melting the supplied liquid waste in the melting space; discharging the molten liquid waste from the melting space; as well as After the liquid waste is discharged, the supply pipe and the delivery unit are cleaned by supplying a solvent.

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